汽车齿轮件加工用PCBN超硬刀具材料的结构与性能  

Study on structure and performance of PCBN super-hard tool materials for car gear parts

作　　者：睢利铭 李坤 宋海生 刘刚 SUI Liming;LI Kun;SONG Haisheng;LIU Gang(School of Vehicle and Traffic Engineering,Henan Institute of Technology,Xinxiang 453000)

机构地区：[1]河南工学院车辆与交通工程学院,河南新乡453000

出　　处：《粉末冶金工业》2024年第2期91-96,共6页Powder Metallurgy Industry

基　　金：河南省科技攻关项目(242102241054,242102520046,242102110360)。

摘　　要：在高温高压条件下,以CBN/Ti/Al为原料合成了PCBN(聚晶立方氮化硼)超硬刀具材料,研究了合成压力对PCBN复合材料抗弯强度、耐磨性及界面组织形貌的影响。测试结果显示,随着合成压力的提高,PCBN复合材料的抗弯强度和耐磨性均有一定程度的提升。采扫描电镜对硬质合金基体与CBN的结合界面进行了测试分析。测试结果表明:提高合成压力可以提高PCBN材料的界面结合强度,将二者牢固地结合在一起,减少分层、裂纹的发生,提高合成产品的成品率。同时,在实验压力范围内(5.5~7 GPa),PCBN的平整性较好,CBN厚度差较小,产品在切割中的利用率较高。在7 GPa下合成的刀具材料性能与住友BN700在加工齿轮件上,切削性能比较接近,有很好的市场前景。PCBN(polycrystalline cubic boron nitride)superhard tool materials were synthesised under high temperature and high pressure conditions using CBN/Ti/Al as raw materials.The effects of the synthesis pressure on the flexural strength,wear resistance and interfacial morphology of the PCBN composites were investigated.The results show that the flexural strength and wear resistance of the PCBN composites increases as the synthesis pressure is increased.The bonding interface between the cemented carbide matrix and CBN is analysed by scanning electron microscopy.The test results show that increasing the synthesis pressure can improve the interfacial bond strength of the PCBN material,reduce the occurrence of delamination and cracks,and improve the yield of the synthesised product.Also,within the pressure range at 5.5-7 GPa,PCBN has better flatness,less CBN thickness difference and higher product utilisation in cutting.The performance of the synthesised tool material at 7 GPa is relatively close to that of Sumitomo BN700 in machining gear parts,with good market prospects.

关 键 词：高压 聚晶立方氮化硼 界面结合 切削 齿轮件 

分 类 号：U466[机械工程—车辆工程]